<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片区域 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog"
            >添加分类
          </el-button>
        </el-col>
      </el-row>
      <tree-table
        class="treeTable"
        :data="goodsList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        :show-row-hover="false"
      >
        <!--是否有效 -->
        <template slot="isOk" slot-scope="scope">
          <i
            v-if="scope.row.cat_deleted === false"
            class="el-icon-success"
            style="color:lightgreen;"
          ></i>
          <i v-else class="el-icon-error" style="color:red;"></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level === 0" size="mini">一级</el-tag>
          <el-tag
            v-else-if="scope.row.cat_level === 1"
            type="success"
            size="mini"
            >二级</el-tag
          >
          <el-tag
            v-else-if="scope.row.cat_level === 2"
            type="warning"
            size="mini"
            >三级</el-tag
          >
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini"
            >编辑</el-button
          >
          <el-button type="danger" icon="el-icon-delete" size="mini"
            >删除</el-button
          >
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[5, 10, 15, 20]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog
      title="添加商品分类"
      :visible.sync="addCateDialogVisible"
      width="50%"
      @close="addCateDialogClosed"
    >
      <el-form
        ref="addGoodsFormRef"
        :model="addCateForm"
        :rules="addCateFormRoles"
        label-width="100px"
      >
        <el-form-item label="分类名称:" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级名称">
          <!-- options用来指定数据源 -->
          <!-- props用来指定配置对象 -->
          <el-cascader
            expand-trigger="hover"
            v-model="selectedKeys"
            :options="parentList"
            :props="{
              expandTrigger: 'hover',
              value: 'cat_id',
              label: 'cat_name',
              children: 'children'
            }"
            @change="parentCateChanged"
            clearable
            change-on-select
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品列表数组
      goodsList: [],
      // 分页查询条件
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      // 总数据条数
      total: 0,
      // 添加商品分类对话框可视
      addCateDialogVisible: false,
      columns: [
        { label: '分类名称', prop: 'cat_name' },
        {
          label: '是否有效',
          type: 'template',
          // 表示当前使用的模板名称
          template: 'isOk'
        },
        {
          label: '排序',
          type: 'template',
          // 表示当前使用的模板名称
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          // 表示当前使用的模板名称
          template: 'opt'
        }
      ],
      // 添加分类表单数据对象
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        // 默认要添加的是一级分类
        cat_level: 0
      },
      addCateFormRoles: {
        cat_name: [
          // 验证角色名称是否合法
          { required: true, message: '请输入角色名称', trigger: 'blur' }
        ]
      },
      parentList: [],
      // cascaderProps: {
      //   value: 'cat_id',
      //   label: 'cat_name',
      //   children: 'children'
      // },
      // 选中的父级分类的ID数组
      selectedKeys: []
    }
  },
  created() {
    this.getGoodsList()
  },
  methods: {
    async getGoodsList() {
      const { data: res } = await this.$http.get('categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      }
      console.log(res)
      // 商品列表展示
      this.goodsList = res.data.result
      // 总数据条数赋值
      this.total = res.data.total
    },
    handleSizeChange(pagesize) {
      this.queryInfo.pagesize = pagesize
      this.getGoodsList()
    },
    handleCurrentChange(currentPage) {
      this.queryInfo.pagenum = currentPage
      this.getGoodsList()
    },
    showAddCateDialog() {
      // 先获取父级分类的数据列表
      this.getParentList()
      this.addCateDialogVisible = true
    },
    async getParentList() {
      const { data: res } = await this.$http.get('categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败！')
      }
      console.log(res.data)
      this.parentList = res.data
    },
    // 选择项发生变化
    parentCateChanged() {
      console.log(this.selectedKeys)
      if (this.selectedKeys.length > 0) {
        const l = this.selectedKeys.length - 1
        this.addCateForm.cat_pid = this.selectedKeys[l]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      }
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    addCateDialogClosed() {
      this.$refs.addGoodsFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    },
    addCate() {
      console.log(this.addCateForm)
      this.$refs.addGoodsFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(
          'categories',
          this.addCateForm
        )
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error('添加分类失败！')
        }

        this.$message.success('添加分类成功！')
        this.getGoodsList()
        this.addCateDialogVisible = false
      })
    }
  }
}
</script>
<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>
